<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
.red{
	background-color:#F00;
	width:100px;
	height:100px;
}
.green{
	background-color:green;
	width:50px;
	height:50px;
}
.blue{
	background-color:blue;
	width:100px;
	height:100px;
}
</style>
</head>

<body>
<div class="red">
	<div class="green"></div>
</div>
<div class="blue"></div>
<script type="text/javascript">
function getColor(dom){
	if(document.defaultView&&document.defaultView.getComputedStyle){
		return document.defaultView.getComputedStyle(dom).backgroundColor;
	}else{
		return dom.currentStyle.backgroundColor;
	}
}
document.body.onclick=function(e){
	var a=e||window.event;
	var src=a.srcElement||a.target;
	alert(getColor(src));
}
</script>
</body>
</html>
